Mayweather, who has seemingly enjoyed toying with the idea of fighting in the UFC, shared a 10-second-long video that shows him pacing inside what appears to be a UFC Octagon.

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While no one actually believes that 40-year-old Mayweather, who easily outboxed McGregor in their boxing superfight last summer, will ever step into the Octagon and allow himself to get destroyed by McGregor in an MMA match, it's still fun to see these two duke it out on Twitter.

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Mayweather's old rival Oscar De La Hoya, for one, ain't buying it. He told TMZ that "Money" would be "tapped out in ten seconds."

What are the chances that this fantasy UFC fight actually happens? Zero.